how to fix P0420 code on Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0420 catalytic converter efficiency issue in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace O2 Sensors (if faulty)

1. Locate the O2 Sensors:
   • Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) O2 sensors.
2. Remove the O2 Sensors:
   • Use an O2 sensor socket to unscrew the sensors from their mounting locations.
   • Carefully disconnect the electrical connectors.
3. Install New O2 Sensors:
   • Apply anti-seize compound on the threads of the new sensors.
   • Screw the new sensors into place and connect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove the Exhaust Components:
   • Disconnect any exhaust clamps or bolts securing the exhaust system to allow access to the catalytic converter.
   • Remove the old catalytic converter from its mounting brackets.
2. Install New Catalytic Converter:
   • Place the new catalytic converter in position and secure it with bolts or clamps as per manufacturer specifications.
   • Ensure that all gaskets are properly seated to prevent leaks.

4. Reconnect Battery and Clear Codes

• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0420 code from the system.